2% , 5% , 10% are the errors in that
An equation to represent this would be 12x+2=T.
x=10 people per large table.
If T=122 then we just have to isolate x on one side of the equation. The first step is to replace T with 120 and then subtract 2 on both sides (to cancel the +2) to get 12x=120. Cancel the 12 by dividing both sides by 12 to get x=10. The number of people seated at each large table would be 10. Hopefully I explained this correctly and helped you understand.

This is found by the volume of a cone formula

Where b is the base and h is the height

How i did it:
<span>25% is equal to 1/4 right? 20 in 4 equal parts (or 20 divided by 4) is 5. 20-5 =15 dollars!</span>